{"id":"CVE-2026-89098","kind":"vulnerability","aliases":["CVE-2026-89098"],"related":[],"title":"nfs-utils: fsidd daemon crash via malformed local socket request","description":"A flaw was found in nfs-utils. The fsidd daemon improperly handles input received over its local domain socket by relying on program assertions to verify command arguments. A local user can exploit this vulnerability by sending a malformed request lacking the required arguments to trigger an assertion failure. This causes the daemon to crash, resulting in a Denial of Service (DoS) for filesystem identifier lookup services until restarted.","summary":"The fsidd daemon in nfs-utils trusts assertions to check arguments received on its local domain socket. A local user who sends a request with required arguments missing can trigger an assertion failure that crashes the daemon until it is restarted.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["linux","nfs","package","self-hosted"],"not_affected_if":["no-fsidd-daemon"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-16T18:19:42+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","triaged_at":"2026-10-25T04:14:07+00:00","updated_at":"2026-10-25T04:14:07+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:14:07Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"local","title":"nfs-utils: fsidd daemon crash via malformed local socket request","impact":"low","summary":"The fsidd daemon in nfs-utils trusts assertions to check arguments received on its local domain socket. A local user who sends a request with required arguments missing can trigger an assertion failure that crashes the daemon until it is restarted.","category":"package","nicknames":[],"who_cares":["nfs","linux","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Denial of service: filesystem identifier lookups stop until the daemon restarts","analyst_note":"Find affected and fixed nfs-utils versions and whether fsidd is enabled by default, from the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-89098 or the upstream advisory.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["no-fsidd-daemon"],"who_is_affected":"Systems running nfs-utils with the fsidd daemon, where local users can reach its local domain socket. The sources do not name affected versions or default configuration.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000552,"input_tokens":3329,"output_tokens":439,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-89098':14A,17A 'argument':35B,51B,94C,110C 'assert':32B,56B,90C,114C 'caus':117C 'check':34B 'command':93C 'crash':6A,59B,121C 'cve':12A,15A 'daemon':5A,26B,61B,76C,119C 'denial':125C 'domain':40B,84C 'dos':128C 'exploit':99C 'failur':57B,115C 'filesystem':130C 'flaw':67C 'found':69C 'fsidd':4A,25B,75C 'handl':78C 'host':23B 'identifi':131C 'improp':77C 'input':79C 'lack':107C 'linux':18B 'local':9A,39B,43B,83C,96C 'lookup':132C 'malform':8A,105C 'miss':52B 'nfs':2A,19B,29B,72C 'nfs-util':1A,28B,71C 'packag':20B 'program':89C 'receiv':36B,80C 'reli':87C 'request':11A,48B,106C 'requir':50B,109C 'restart':65B,135C 'result':122C 'self':22B 'self-host':21B 'send':46B,103C 'servic':127C,133C 'socket':10A,41B,85C 'trigger':54B,112C 'trust':31B 'user':44B,97C 'util':3A,30B,73C 'verifi':92C 'via':7A 'vulner':101C","nicknames":[],"mitigations":[],"who_affected":"Systems running nfs-utils with the fsidd daemon, where local users can reach its local domain socket. The sources do not name affected versions or default configuration.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T18:19:42+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvss_by":"secalert@redhat.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-89098","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89098","severity":null,"published_at":"2026-10-16T18:19:42+00:00","modified_at":"2026-10-19T15:17:09+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}